New file.

2 files changed, 405 insertions, 0 deletions

diff --git a/src/sheap.c b/src/sheap.c
new file mode 100644
index 00000000000..e8ec8a00fd2
--- /dev/null
+++ b/src/sheap.c
@@ -0,0 +1,101 @@
+/* simulate sbrk() with an array in .bss, for unexec() support for Cygwin;
+   complete rewrite of xemacs Cygwin unexec() code
+
+   Copyright (C) 2004
+   Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include <config.h>
+#include <stdio.h>
+#include "lisp.h"
+
+#include <unistd.h>
+
+#ifdef HAVE_X_WINDOWS
+#define STATIC_HEAP_SIZE        (7 * 1024 * 1024)
+#else
+#define STATIC_HEAP_SIZE        (7 * 1024 * 1024)
+#endif
+
+int debug_sheap = 0;
+
+#define BLOCKSIZE 4096
+
+char bss_sbrk_buffer[STATIC_HEAP_SIZE];
+char *bss_sbrk_ptr;
+int bss_sbrk_did_unexec;
+
+void *
+bss_sbrk (ptrdiff_t request_size)
+{
+  if (!bss_sbrk_ptr)
+    {
+      bss_sbrk_ptr = bss_sbrk_buffer;
+#ifdef CYGWIN
+      sbrk (BLOCKSIZE);         /* force space for fork to work */
+#endif
+    }
+
+  if (!(int) request_size)
+    {
+      return (bss_sbrk_ptr);
+    }
+  else if (bss_sbrk_ptr + (int) request_size < bss_sbrk_buffer)
+    {
+      printf
+        ("attempt to free too much: avail %d used %d failed request %d\n",
+         STATIC_HEAP_SIZE, bss_sbrk_ptr - bss_sbrk_buffer,
+         (int) request_size);
+      exit (-1);
+      return 0;
+    }
+  else if (bss_sbrk_ptr + (int) request_size >
+           bss_sbrk_buffer + STATIC_HEAP_SIZE)
+    {
+      printf ("static heap exhausted: avail %d used %d failed request %d\n",
+              STATIC_HEAP_SIZE,
+              bss_sbrk_ptr - bss_sbrk_buffer, (int) request_size);
+      exit (-1);
+      return 0;
+    }
+  else if ((int) request_size < 0)
+    {
+      bss_sbrk_ptr += (int) request_size;
+      if (debug_sheap)
+        printf ("freed size %d\n", request_size);
+      return bss_sbrk_ptr;
+    }
+  else
+    {
+      char *ret = bss_sbrk_ptr;
+      if (debug_sheap)
+        printf ("allocated 0x%08x size %d\n", ret, request_size);
+      bss_sbrk_ptr += (int) request_size;
+      return ret;
+    }
+}
+
+void
+report_sheap_usage (int die_if_pure_storage_exceeded)
+{
+  char buf[200];
+  sprintf (buf, "Static heap usage: %d of %d bytes",
+           bss_sbrk_ptr - bss_sbrk_buffer, STATIC_HEAP_SIZE);
+  message ("%s", buf);
+}
diff --git a/src/unexcw.c b/src/unexcw.c
new file mode 100644
index 00000000000..58e356fdb0d
--- /dev/null
+++ b/src/unexcw.c
@@ -0,0 +1,304 @@
+/* unexec() support for Cygwin;
+   complete rewrite of xemacs Cygwin unexec() code
+
+   Copyright (C) 2004
+   Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include <config.h>
+#include <lisp.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <a.out.h>
+#include <unistd.h>
+#include <assert.h>
+
+#define DOTEXE ".exe"
+
+extern int bss_sbrk_did_unexec;
+
+/* emacs symbols that indicate where bss and data end for emacs internals */
+extern char my_endbss[];
+extern char my_edata[];
+
+/*
+** header for Windows executable files
+*/
+typedef struct
+{
+  FILHDR file_header;
+  PEAOUTHDR file_optional_header;
+  SCNHDR section_header[32];
+} exe_header_t;
+
+int debug_unexcw = 0;
+
+/*
+** Read the header from the executable into memory so we can more easily access it.
+*/
+static exe_header_t *
+read_exe_header (int fd, exe_header_t * exe_header_buffer)
+{
+  int i;
+  int ret;
+
+  assert (fd >= 0);
+  assert (exe_header_buffer != 0);
+
+  ret = lseek (fd, 0L, SEEK_SET);
+  assert (ret != -1);
+
+  ret =
+    read (fd, &exe_header_buffer->file_header,
+          sizeof (exe_header_buffer->file_header));
+  assert (ret == sizeof (exe_header_buffer->file_header));
+
+  assert (exe_header_buffer->file_header.e_magic == 0x5a4d);
+  assert (exe_header_buffer->file_header.nt_signature == 0x4550);
+  assert (exe_header_buffer->file_header.f_magic == 0x014c);
+  assert (exe_header_buffer->file_header.f_nscns > 0);
+  assert (exe_header_buffer->file_header.f_nscns <=
+          sizeof (exe_header_buffer->section_header) /
+          sizeof (exe_header_buffer->section_header[0]));
+  assert (exe_header_buffer->file_header.f_opthdr > 0);
+
+  ret =
+    read (fd, &exe_header_buffer->file_optional_header,
+          sizeof (exe_header_buffer->file_optional_header));
+  assert (ret == sizeof (exe_header_buffer->file_optional_header));
+
+  assert (exe_header_buffer->file_optional_header.magic == 0x010b);
+
+  for (i = 0; i < exe_header_buffer->file_header.f_nscns; ++i)
+    {
+      ret =
+        read (fd, &exe_header_buffer->section_header[i],
+              sizeof (exe_header_buffer->section_header[i]));
+      assert (ret == sizeof (exe_header_buffer->section_header[i]));
+    }
+
+  return (exe_header_buffer);
+}
+
+/*
+** Fix the dumped emacs executable:
+**
+** - copy .data section data of interest from running executable into
+**   output .exe file
+**
+** - convert .bss section into an initialized data section (like
+**   .data) and copy .bss section data of interest from running
+**   executable into output .exe file
+*/
+static void
+fixup_executable (int fd)
+{
+  exe_header_t exe_header_buffer;
+  exe_header_t *exe_header;
+  int i;
+  int ret;
+  int found_data = 0;
+  int found_bss = 0;
+
+  exe_header = read_exe_header (fd, &exe_header_buffer);
+  assert (exe_header != 0);
+
+  assert (exe_header->file_header.f_nscns > 0);
+  for (i = 0; i < exe_header->file_header.f_nscns; ++i)
+    {
+      unsigned long start_address =
+        exe_header->section_header[i].s_vaddr +
+        exe_header->file_optional_header.ImageBase;
+      unsigned long end_address =
+        exe_header->section_header[i].s_vaddr +
+        exe_header->file_optional_header.ImageBase +
+        exe_header->section_header[i].s_paddr;
+      if (debug_unexcw)
+        printf ("%8s start 0x%08x end 0x%08x\n",
+                exe_header->section_header[i].s_name,
+                start_address, end_address);
+      if (my_edata >= (char *) start_address
+          && my_edata < (char *) end_address)
+        {
+          /* data section */
+          ret =
+            lseek (fd, (long) (exe_header->section_header[i].s_scnptr),
+                   SEEK_SET);
+          assert (ret != -1);
+          ret =
+            write (fd, (char *) start_address,
+                   my_edata - (char *) start_address);
+          assert (ret == my_edata - (char *) start_address);
+          ++found_data;
+          if (debug_unexcw)
+            printf ("         .data, mem start 0x%08x mem length %d\n",
+                    start_address, my_edata - (char *) start_address);
+          if (debug_unexcw)
+            printf ("         .data, file start %d file length %d\n",
+                    (int) exe_header->section_header[i].s_scnptr,
+                    (int) exe_header->section_header[i].s_paddr);
+        }
+      else if (my_endbss >= (char *) start_address
+               && my_endbss < (char *) end_address)
+        {
+          /* bss section */
+          ++found_bss;
+          if (exe_header->section_header[i].s_flags & 0x00000080)
+            {
+              /* convert uninitialized data section to initialized data section */
+              struct stat statbuf;
+              ret = fstat (fd, &statbuf);
+              assert (ret != -1);
+
+              exe_header->section_header[i].s_flags &= ~0x00000080;
+              exe_header->section_header[i].s_flags |= 0x00000040;
+
+              exe_header->section_header[i].s_scnptr =
+                (statbuf.st_size +
+                 exe_header->file_optional_header.FileAlignment) /
+                exe_header->file_optional_header.FileAlignment *
+                exe_header->file_optional_header.FileAlignment;
+
+              exe_header->section_header[i].s_size =
+                (exe_header->section_header[i].s_paddr +
+                 exe_header->file_optional_header.FileAlignment) /
+                exe_header->file_optional_header.FileAlignment *
+                exe_header->file_optional_header.FileAlignment;
+
+              ret =
+                lseek (fd,
+                       (long) (exe_header->section_header[i].s_scnptr +
+                               exe_header->section_header[i].s_size - 1),
+                       SEEK_SET);
+              assert (ret != -1);
+              ret = write (fd, "", 1);
+              assert (ret == 1);
+
+              ret =
+                lseek (fd,
+                       (long) ((char *) &exe_header->section_header[i] -
+                               (char *) exe_header), SEEK_SET);
+              assert (ret != -1);
+              ret =
+                write (fd, &exe_header->section_header[i],
+                       sizeof (exe_header->section_header[i]));
+              assert (ret == sizeof (exe_header->section_header[i]));
+              if (debug_unexcw)
+                printf ("         seek to %ld, write %d\n",
+                        (long) ((char *) &exe_header->section_header[i] -
+                                (char *) exe_header),
+                        sizeof (exe_header->section_header[i]));
+            }
+          /* write initialized data section */
+          ret =
+            lseek (fd, (long) (exe_header->section_header[i].s_scnptr),
+                   SEEK_SET);
+          assert (ret != -1);
+          ret =
+            write (fd, (char *) start_address,
+                   my_endbss - (char *) start_address);
+          assert (ret == (my_endbss - (char *) start_address));
+          if (debug_unexcw)
+            printf ("         .bss, mem start 0x%08x mem length %d\n",
+                    start_address, my_endbss - (char *) start_address);
+          if (debug_unexcw)
+            printf ("         .bss, file start %d file length %d\n",
+                    (int) exe_header->section_header[i].s_scnptr,
+                    (int) exe_header->section_header[i].s_paddr);
+        }
+    }
+  assert (found_bss == 1);
+  assert (found_data == 1);
+}
+
+/*
+** Windows likes .exe suffixes on executables.
+*/
+static char *
+add_exe_suffix_if_necessary (const char *name, char *modified)
+{
+  int i = strlen (name);
+  if (i <= (sizeof (DOTEXE) - 1))
+    {
+      sprintf (modified, "%s%s", name, DOTEXE);
+    }
+  else if (!strcasecmp (name + i - (sizeof (DOTEXE) - 1), DOTEXE))
+    {
+      strcpy (modified, name);
+    }
+  else
+    {
+      sprintf (modified, "%s%s", name, DOTEXE);
+    }
+  return (modified);
+}
+
+int
+unexec (char *outfile, char *infile, unsigned start_data, unsigned d1,
+        unsigned d2)
+{
+  char infile_buffer[FILENAME_MAX];
+  char outfile_buffer[FILENAME_MAX];
+  int fd_in;
+  int fd_out;
+  int ret;
+  int ret2;
+
+  if (bss_sbrk_did_unexec)
+    {
+      /* can only dump once */
+      printf ("You can only dump emacs once on this platform.\n");
+      return (1);
+    }
+
+  report_sheap_usage (1);
+
+  infile = add_exe_suffix_if_necessary (infile, infile_buffer);
+  outfile = add_exe_suffix_if_necessary (outfile, outfile_buffer);
+
+  fd_in = open (infile, O_RDONLY | O_BINARY);
+  assert (fd_in >= 0);
+  fd_out = open (outfile, O_RDWR | O_TRUNC | O_CREAT | O_BINARY, 0755);
+  assert (fd_out >= 0);
+  for (;;)
+    {
+      char buffer[4096];
+      ret = read (fd_in, buffer, sizeof (buffer));
+      if (ret == 0)
+        {
+          /* eof */
+          break;
+        }
+      assert (ret > 0);
+      /* data */
+      ret2 = write (fd_out, buffer, ret);
+      assert (ret2 == ret);
+    }
+  ret = close (fd_in);
+  assert (ret == 0);
+
+  bss_sbrk_did_unexec = 1;
+  fixup_executable (fd_out);
+  bss_sbrk_did_unexec = 0;
+
+  ret = close (fd_out);
+  assert (ret == 0);
+
+  return (0);
+}